CN110395781A - Salt eluriates Processes and apparatus, salt making apparatus and high slat-containing wastewater processing system - Google Patents

Abstract

The embodiments of the present application provide a salt elutriation process and equipment, a salt production device, and a high-salt wastewater treatment system. The salt elutriation process includes using a salt leg to perform primary elutriation on the salt slurry; stage elutriation, and simultaneously thicken the brine slurry during the secondary elutriation. The salt elutriation process and equipment in this application adopts two-stage enhanced elutriation combining a salt leg and a salt washer, which can significantly improve the quality of the separated salt.

Description

Salt elutriation process and equipment, salt production equipment and high-salt wastewater treatment system

technical field

The application relates to the technical field of chemical industry, specifically, to a salt elutriation process and equipment, a salt making device and a high-salt wastewater treatment system.

Background technique

With the continuous improvement of high-salt wastewater zero-discharge industry requirements, the zero-discharge of high-salt wastewater has also developed from the early miscellaneous salt technology to the salt separation technology. Compared with traditional salt chemical production, high-salt wastewater often contains a large number of impurities, inorganic ions and organic substances, and traditional biochemical techniques are difficult to remove these impurities from brine.

Salt elutriation technology is widely used in salt chemical production. However, for zero discharge of high-salt wastewater, it is difficult to use salt elutriation technology to remove a large number of impurity inorganic ions and organic substances in brine, resulting in the formation of The salt quality is not up to standard and cannot meet the needs.

Therefore, for high-salt wastewater, how to improve the quality of salt is an important problem encountered in the engineering of the zero-discharge salt separation process using the evaporation crystallization process.

Contents of the invention

The purpose of the embodiments of the present application is to provide a salt elutriation process and salt elutriation equipment corresponding to the process, which can improve the quality of the separated salt in the zero discharge salt separation process by using the evaporation crystallization process in high-salt wastewater .

The embodiment of the present application provides a salt elutriation equipment, including:

Use salt legs to perform primary elutriation on salt slurry;

Drain the salt slurry flowing out of the salt leg into the salt washer, use the salt washer to perform secondary elutriation on the salt slurry, and simultaneously thicken the salt slurry during the secondary elutriation process thick.

In the above implementation process, firstly, the salt slurry is firstly elutriated by using the salt leg. The elutriation in this step is similar to the traditional salt chemical production process, that is, the salt slurry is firstly elutriated by the salt leg. The salt slurry washed by salt slurry is drained into a salt washing device, and the salt slurry is washed twice in the salt washing device. In order not to increase equipment, the salt washing device has the structural characteristics of a thickener. That is to say, when the salt slurry is washed twice by the salt washer, the salt slurry can be thickened at the same time. Two-stage intensive elutriation using a combination of salt legs and salt scrubbers can significantly improve the quality of the separated salt.

In a possible implementation manner, performing primary elutriation on salt slurry by using salt legs includes:

Pass the first elutriation solution into the salt leg at the bottom of the salt leg, and use the first elutriation solution to perform primary elutriation on the salt slurry in the salt leg;

Said utilizing said salt washer to carry out secondary elutriation to said salt slurry comprises:

Pass the second elutriation solution into the salt washer at the bottom of the salt washer, and use the second elutriation solution to perform secondary elutriation on the salt slurry.

In the above realization process, the first elutriation solution is passed into the salt leg from the bottom of the salt leg, and the salt slurry in the salt leg is subjected to gravity, and the crystallized salt particles in the salt slurry are gradually enriched at the bottom of the salt leg. After the elutriation solution enters the salt leg from the bottom of the salt leg, it is flushed with the enriched crystallized salt particles, the first elutriation solution is fully mixed with the crystallized salt particles, and the mother liquor containing high-concentration impurities on the surface of the crystallized salt particles is replaced, and then Realize the elutriation of salt slurry.

Similarly, the second elutriation liquid is passed into the salt washer from the bottom of the salt washer, and the salt slurry in the salt washer is also enriched at the bottom of the salt washer by gravity, and the second elutriation liquid is self-washed. After the bottom of the salt tank enters the salt washer, it is flushed with the enriched crystallized salt particles, and the second elutriation liquid is fully mixed with the crystallized salt particles to replace the mother liquor containing high-concentration impurities on the surface of the crystallized salt particles, thereby realizing the salt Enhanced elutriation of pulp.

As an embodiment, the flow volume ratio of the first elutriation solution to the salt slurry entering the salt leg is 0.2-4;

The flow volume ratio of the second elutriation solution to the salt slurry entering the salt washer is 0.1-4.

In the above implementation process, in the zero-emission salt separation process using the evaporation crystallization process, elutriation of the salt slurry is a necessary step in the entire salt production process, and the elutriation equipment is connected to its upstream equipment and downstream equipment. The amount of the first elutriation solution and the second elutriation solution input into the elutriation equipment is directly related to the evaporation and heat in the salt making system. If the amount of elutriation solution is not considered in order to achieve the effect of elutriation, it will affect the material balance and heat balance of the entire salt making system. And the flow volume ratio of the first elutriation liquid and the salt slurry entering the salt leg is 0.2～4; when the flow volume ratio of the second elutriation liquid and the salt slurry entering the salt washer is between 0.1～4, it can ensure Heat balance and material balance of salt production system.

In a possible implementation manner, when the salt washer performs secondary elutriation on the salt slurry, it further includes: stirring the salt slurry. By stirring the salt slurry, the elutriation solution and the salt slurry are fully mixed, which can enhance the flow rate of the fluid on the surface of the salt particles to be elutriated, and accelerate the elutriation efficiency.

In a possible implementation manner, the first elutriation solution is one or more combinations of the salt crystallization system feed, distillate, clear water, and prepared saturated solution;

The second elutriation solution is one or more combinations of the salt crystallization system feed, distillate, clear water, and prepared saturated solution.

In a possible implementation manner, the solid content of the salt slurry entering the salt leg is 2-20%, and the solid content of the salt slurry entering the salt washer is 5-40%. The solid content of the salt slurry after elutriation is 5-50%.

According to another aspect of the present invention, a kind of salt elutriation equipment is provided, comprising:

Salt legs for primary elutriation of brine slurry;

The salt washer is used to perform secondary elutriation on the salt slurry flowing out of the salt leg, and simultaneously thicken the salt slurry during the secondary elutriation process.

In the above realization process, the salt leg is used to carry out one-stage elutriation on the salt slurry, and the salt slurry that has been elutriated by the salt slurry is drained into the salt washing device with both elutriation and thickening functions. The slurry is subjected to secondary elutriation, and the salt slurry is thickened at the same time. Two-stage intensive elutriation using a combination of salt legs and salt scrubbers can significantly improve the quality of the separated salt.

In a possible implementation manner, the salt scrubber includes:

The elutriation cylinder includes an overflow part and an elutriation part arranged up and down; the cross-sectional area of the overflow part is larger than that of the elutriation part; the overflow part is provided with an overflow outlet; the elutriation part It is equipped with a second elutriation solution inlet and a brine slurry outlet;

The inlet end of the slurry inlet pipe is located above the overflow part and communicates with the discharge port of the salt leg, and the outlet end of the slurry inlet pipe passes through the overflow part and extends into the elutriation part.

In the above realization process, the salt slurry enters from the inlet end of the pulp inlet pipe and descends to the elutriation part of the elutriation cylinder along the pulp inlet pipe, and mixes with the elutriation liquid contained in the elutriation part, and the elutriation liquid will The mother liquor with high concentration of impurities attached to the surface of the crystallized salt is flushed and replaced. At the same time, the cross-sectional area of the overflow part is larger than that of the elutriation part, and the flow velocity of the overflow part with a larger cross-section is low, and the upward thrust of the water is not enough to overcome the gravity of the salt particles themselves, so the overflow part can suspend fewer particles. Under the action of gravity, the crystalline salt particles are gradually enriched in the elutriation section to achieve the thickening effect.

In a possible implementation manner, the salt washer further includes: an agitator disposed in the elutriation part. The agitator stirs the salt slurry, and the elutriation liquid and the salt slurry are fully mixed, which can enhance the flow rate of the fluid on the surface of the salt particles to be elutriated, and accelerate the elutriation efficiency.

In a possible implementation manner, the overflow part and the elutriation part are connected by a buffer part that tapers from top to bottom.

In a possible implementation manner, the salt leg includes a rounded table cylinder, an intermediate cylinder and a conical cylinder arranged sequentially from top to bottom;

A first elutriation solution inlet is provided at the bottom of the conical cylinder;

The intermediate cylinder is provided with at least one discharge port.

In the above implementation process, the cross-sectional area of the inverted table cylinder is larger than that of the intermediate cylinder, which is mainly used to filter out the clear liquid containing no or little crystalline salt particles and provide a channel for the clear liquid to float. The crystallized salt particles move downward in the intermediate cylinder and are gradually enriched. The elutriation solution entering the intermediate cylinder is flushed and replaced with the mother liquor containing high concentration of impurities on the surface of the crystallized salt to realize one-time elutriation of the salt slurry. The cross-sectional area of the conical cylinder increases sequentially from bottom to top, and the elutriation liquid enters from the bottom of the conical cylinder, and the diffusion area of the elutriation liquid gradually increases, which is conducive to the full mixing of the elutriation liquid and the salt slurry, and the elutriation effect is better. excellent.

In a possible implementation manner, when there are multiple discharge ports, the multiple discharge ports are located at different installation heights.

In the above implementation process, the particle diameters of the crystalline salt particles enriched at different heights in the intermediate cylinder are different, and the discharge ports are located at different setting heights, so that crystalline salt particles with different particle sizes can be obtained.

In a possible implementation manner, the setting height of the discharge port is higher than the setting height of the inlet end of the slurry inlet pipe; or

The setting height of the discharge port is lower than that of the inlet end of the slurry inlet pipe, and the salt slurry flowing out of the discharge port is input into the slurry feed pipe through a pump.

In the above implementation process, the setting height of the discharge port is higher than that of the inlet end of the slurry inlet pipe, so the salt slurry in the salt leg can flow into the slurry inlet pipe of the salt washer by gravity.

According to another aspect of the present invention, a salt production device is also provided, including the above-mentioned salt elutriation equipment.

According to yet another aspect of the present invention, a high-salt wastewater treatment system is also provided, including the above-mentioned salt elutriation equipment.

It can be known from the above technical solutions that the salt elutriation process and equipment in this application adopts two-stage enhanced elutriation combining salt legs and salt washers, which can significantly improve the quality of the separated salt.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings that need to be used in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, so It should not be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings according to these drawings without creative work.

Fig. 1 is the flowchart of a kind of salt elutriation process that the embodiment of the application provides;

Fig. 2 is a schematic structural diagram of a salt elutriation equipment provided in the embodiment of the present application.

Icons: 100-salt leg; 200-salt washer; 110-inversion table cylinder; 120-intermediate cylinder; 121-discharge port; 130-conical cylinder; ; 220-slurry inlet pipe; 230-stirrer; 211-overflow part; 212-elution part; 213-overflow outlet;

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second" and the like are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

The inventors of the present application found that the salt slurry in the existing salt chemical production process is relatively pure. In the salt separation process, the salt slurry is usually washed and directly entered into the thickener for thickening, while the high-salt wastewater often Contains a large amount of impurity inorganic ions and organic substances. Using the elutriation equipment and elutriation process in the traditional salt chemical industry to wash and enter the thickener, it cannot remove a large amount of impurity inorganic ions and organic substances in the brine. In order to improve the quality of the separated salt, the inventors in this application creatively proposed that on the basis of elutriation in traditional salt chemical industry, the elutriated salt slurry should be elutriated again, and this elutriation should not occupy a separate unit as much as possible. Instead, elutriation and thickening are carried out at the same time. Based on this idea, the inventor of the present application also provides a set of salt elutriation equipment corresponding to this idea.

The salt elutriation process and salt elutriation equipment in this application will be described in detail below through specific examples.

Fig. 1 is a flow chart of a salt elutriation process provided by the embodiment of the present application. Shown in Figure 1, the salt elutriation process comprises the following steps:

S101: using salt legs to perform primary elutriation on the salt slurry;

S102: Drain the salt slurry flowing out of the salt leg into a salt washer, use the salt washer to perform secondary elutriation on the salt slurry, and simultaneously wash the salt slurry during the secondary elutriation process To thicken.

In the above implementation process, firstly, the salt slurry is firstly elutriated by using the salt leg. The elutriation in this step is similar to the traditional salt chemical production process, that is, the salt slurry is firstly elutriated by the salt leg. The salt slurry washed by salt slurry is drained into a salt washing device, and the salt slurry is washed twice in the salt washing device. In order not to increase equipment, the salt washing device has the structural characteristics of a thickener. That is to say, when the salt slurry is washed twice by the salt washer, the salt slurry can be thickened at the same time. Two-stage intensive elutriation using a combination of salt legs and salt scrubbers can significantly improve the quality of the separated salt.

In one possible implementation, primary elutriation of salt slurry using salt legs includes:

Pass the first elutriation liquid into the salt leg at the bottom of the salt leg, and use the first elutriation liquid to carry out primary elutriation to the salt slurry in the salt leg;

Secondary elutriation of brine slurry using a salt scrubber includes:

The second elutriation liquid is passed into the salt washer at the bottom of the salt washer, and the salt slurry is subjected to secondary elutriation by using the second elutriation liquid.

In the above realization process, the first elutriation solution is passed into the salt leg from the bottom of the salt leg, and the salt slurry in the salt leg is subjected to gravity, and the crystallized salt particles in the salt slurry are gradually enriched at the bottom of the salt leg. After the elutriation solution enters the salt leg from the bottom of the salt leg, it is flushed with the enriched crystallized salt particles, the first elutriation solution is fully mixed with the crystallized salt particles, and the mother liquor containing high-concentration impurities on the surface of the crystallized salt particles is replaced, and then Realize the elutriation of salt slurry.

Similarly, the second elutriation liquid is passed into the salt washer from the bottom of the salt washer, and the salt slurry in the salt washer is also enriched at the bottom of the salt washer by gravity, and the second elutriation liquid is self-washed. After the bottom of the salt tank enters the salt washer, it is flushed with the enriched crystallized salt particles, and the second elutriation liquid is fully mixed with the crystallized salt particles to replace the mother liquor containing high-concentration impurities on the surface of the crystallized salt particles, thereby realizing the salt Enhanced elutriation of pulp.

As an embodiment, the flow volume ratio of the first elutriation liquid to the salt slurry entering the salt leg is 0.2-4; the flow volume ratio of the second elutriation liquid to the salt slurry entering the salt washer is 0.1-4.

In the zero-emission salt separation process using the evaporation crystallization process, elutriation of the salt slurry is a necessary step in the entire salt production process, and the elutriation equipment is connected to its upstream equipment and downstream equipment. The amount of the first elutriation solution and the second elutriation solution input into the elutriation equipment is directly related to the evaporation and heat in the salt making system. If the amount of elutriation solution is not considered in order to achieve the effect of elutriation, it will affect the material balance and heat balance of the entire salt making system. And the flow volume ratio of the first elutriation liquid and the salt slurry entering the salt leg is 0.2～4; when the flow volume ratio of the second elutriation liquid and the salt slurry entering the salt washer is between 0.1～4, it can ensure Heat balance and material balance of salt production system.

In a possible implementation manner, when the salt washer performs secondary elutriation on the salt slurry, stirring the salt slurry is also included. By stirring the salt slurry, the elutriation solution and the salt slurry are fully mixed, which can enhance the flow rate of the fluid on the surface of the salt particles to be elutriated, and accelerate the elutriation efficiency.

In a possible implementation manner, the first elutriation solution is one or more than one combination of the salt crystallization system feed, distillate, clear water, and prepared saturated solution;

The second elutriation solution is one or more than one combination of the salt crystallization system feed, distillate, clear water, and prepared saturated solution.

In a possible implementation, the solid content of the salt slurry entering the salt leg is 2-20%, the solid content of the salt slurry entering the salt washer is 5-40%, and the salt slurry after secondary elutriation in the salt washer The solid content is 5-50%.

According to another aspect of the present invention, a salt elutriation apparatus is provided. Fig. 2 is a schematic structural diagram of a salt elutriation equipment provided in the embodiment of the present application. As shown in FIG. 2 , the salt elutriation equipment includes a salt leg 100 and a salt washer 200 .

The salt leg 100 is used for primary elutriation of the salt slurry; the salt washer 200 is used for secondary elutriation of the brine slurry flowing out of the salt leg 100, and simultaneously thickens the salt slurry during the secondary elutriation process.

In the above implementation process, the salt leg 100 is used to perform primary elutriation on the salt slurry, and the salt slurry elutriated by the salt slurry is drained into the salt washer 200 which has both elutriation and thickening functions. The salt washer 200 In the middle, the salt slurry is washed twice, and the salt slurry is thickened at the same time. The two-stage enhanced elutriation combined with the salt leg 100 and the salt washer 200 can significantly improve the quality of the separated salt.

In a possible implementation manner, referring to FIG. 2 , the salt washer 200 includes an elutriation cylinder 210 and a slurry feeding pipe 220 .

The elutriation cylinder 210 includes an overflow portion 211 and an elutriation portion 212 arranged up and down. The overflow part 211 is provided with an overflow outlet 213 ; the elutriation cylinder 210 is also provided with a second elutriation solution inlet 214 and a brine slurry outlet 215 .

The inlet end of the slurry inlet pipe 220 is located above the overflow portion 211 , and the outlet end passes through the overflow portion 211 and extends into the elutriation portion 212 .

In the above implementation process, the salt slurry enters from the inlet end of the pulp inlet pipe 220 and descends to the elutriation part 212 of the elutriation cylinder 210 along the pulp inlet pipe 220, mixes with the elutriation liquid contained in the elutriation part 212, and elutriates The washing liquid washes and replaces the mother liquor containing high concentration of impurities attached to the surface of the crystallized salt in the salt slurry. Simultaneously, the cross-sectional area of the overflow part 211 is greater than the cross-sectional area of the elutriation part 212, and the overflow part 211 with a larger cross-section has a low flow rate, and the upward thrust of the water is not enough to overcome the gravity of the salt particles themselves, so the overflow part 211 can be suspended Less grainy. Under the action of gravity, the crystallized salt particles are gradually enriched in the elutriation part 212 to realize the effect of thickening.

In a possible implementation manner, the salt washer 200 further includes an agitator 230 disposed in the elutriation part 212 . The stirrer 230 stirs the salt slurry, and the elutriation solution is fully mixed with the salt slurry, which can increase the flow rate of the fluid on the surface of the salt particles to be elutriated, and accelerate the elutriation efficiency.

In a possible implementation manner, the overflow part 211 and the elutriation part 212 are connected by a buffer part 216 that tapers from top to bottom.

In the above implementation process, the cross-sectional area of the overflow portion 211 is larger than the cross-sectional area of the elutriation portion 212, the flow velocity of the water flow in the overflow portion 211 is relatively slow, and the flow velocity of the elutriation portion 212 is faster than the overflow portion 211, and the buffer portion 216 The cross section of the cross section gradually becomes smaller, which can buffer the water flow at the junction of the overflow part 211 and the elutriation part 212, so that there are as few suspended particles as possible in the overflow area, and provide a channel for the supernatant to float up.

In a possible implementation manner, the salt leg 100 includes a rounded table cylinder 110 , a middle cylinder 120 and a conical cylinder 130 arranged sequentially from top to bottom. The bottom of the conical cylinder 130 is provided with a first elutriation liquid inlet 131 ; the middle cylinder 120 is provided with at least one discharge port 121 .

In the above implementation process, the cross-sectional area of the rounded table cylinder 110 is larger than that of the intermediate cylinder 120, and is mainly used to filter out the clear liquid containing no or little crystallized salt particles and provide a channel for the clear liquid to float up. The crystallized salt particles move downward in the intermediate cylinder 120 and are gradually enriched. The elutriation liquid entering the intermediate cylinder 120 is flushed and replaced with the mother liquor containing high concentration of impurities on the surface of the crystallized salt, realizing one-time elutriation of the salt slurry. The cross-sectional area of the conical cylinder 130 increases sequentially from bottom to top, and the elutriation liquid is introduced from the bottom of the conical cylinder 130, and the diffusion area of the elutriation liquid gradually increases, which is conducive to the full mixing of the elutriation liquid and the salt slurry, and the elutriation The effect is better.

In a possible implementation manner, when there are multiple discharge ports, the multiple discharge ports are located at different installation heights.

In the above implementation process, the particle diameters of the crystalline salt particles enriched at different heights in the intermediate cylinder 120 are different, and the outlets are located at different installation heights, so that crystalline salt particles with different particle sizes can be obtained.

In a possible implementation manner, the setting height of the discharge port is higher than the setting height of the inlet end of the pulp inlet pipe 220 .

In the above implementation process, the setting height of the discharge port is higher than that of the inlet end of the slurry inlet pipe 220 , so the salt slurry in the salt leg 100 can flow into the slurry inlet pipe 220 of the salt washer 200 by gravity.

It should be noted that the setting height of the discharge port may not be higher than the setting height of the inlet end of the pulp inlet pipe 220 . When the setting height of the discharge port is lower than the setting height of the inlet end of the slurry inlet pipe 220 , the salt slurry in the salt leg 100 can be input into the slurry inlet pipe 220 of the salt washer 200 by means of pumping.

According to another aspect of the present invention, a salt production device comprising the above-mentioned salt elutriation equipment is provided.

According to yet another aspect of the present invention, a high-salt wastewater treatment system comprising the above-mentioned salt elutriation equipment is provided.

In the several embodiments provided in this application, it should be understood that the disclosed devices and methods may also be implemented in other ways. The above descriptions are only examples of the present application, and are not intended to limit the scope of protection of the present application. For those skilled in the art, various modifications and changes may be made to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application. It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

Claims (15)

1. a kind of salt eluriates technique characterized by comprising

Level-one elutriation is carried out to salt slurry using salt leg；

It will be drained in desalinization of soil by flooding or leaching device by the salt slurry flowed out in the salt leg, second level carried out to the salt slurry using the desalinization of soil by flooding or leaching device and is washed in a pan It washes, and stiff is carried out to the salt slurry simultaneously during second level is eluriated.

2. salt according to claim 1 eluriates technique, which is characterized in that described to carry out level-one elutriation to salt slurry using salt leg Include:

It is passed through the first elutriation liquid into salt leg in the bottom of the salt leg, eluriates liquid using first and one is carried out to the salt slurry in salt leg Grade is eluriated；

It is described to include: to salt slurry progress second level elutriation using the desalinization of soil by flooding or leaching device

It is passed through the second elutriation liquid into desalinization of soil by flooding or leaching device in the bottom of desalinization of soil by flooding or leaching device, and eluriates liquid using second and second level is carried out to the salt slurry It eluriates.

3. salt according to claim 2 eluriates technique, which is characterized in that described first eluriates liquid and enter the salt leg The flow volume ratio of salt slurry is 0.2~4；

The flow volume ratio of described second salt slurry eluriating liquid and entering in the desalinization of soil by flooding or leaching device is 0.1~4.

4. salt according to claim 1 eluriates technique, which is characterized in that carry out second level to the salt slurry in the desalinization of soil by flooding or leaching device When elutriation, further includes:

The salt slurry is stirred.

5. salt according to claim 2 eluriates technique, which is characterized in that described first eluriate liquid be salt crystal system into Material, distillate, clear water, preparation one of saturated solution or more than one combination liquid；

Described second eluriates one of saturated solution that liquid is the charging of salt crystal system, distillate, clear water, preparation or a kind of Above combination liquid.

6. eluriating technique to any salt in 5 according to claim 1, which is characterized in that the salt slurry for entering the salt leg is solid Content is 2~20%, and the salt slurry solid content into the desalinization of soil by flooding or leaching device is 5~40%, the salt after desalinization of soil by flooding or leaching device second level elutriation Starching solid content is 5~50%.

7. a kind of salt elutriation apparatus characterized by comprising

Salt leg, for carrying out level-one elutriation to salt slurry；

Desalinization of soil by flooding or leaching device carries out second level elutriation to the salt slurry by flowing out in the salt leg, and simultaneously to described during second level is eluriated Salt slurry carries out stiff.

8. salt elutriation apparatus according to claim 7, which is characterized in that the desalinization of soil by flooding or leaching device includes:

Eluriate cylinder, including overflow part arranged up and down and elutriation portion；The area of section of the overflow part is greater than the elutriation portion Area of section；The overflow part is exported equipped with overflow；The elutriation portion is provided with the second elutriation liquid import and salt slurry outlet；

Inlet pipe, input end are located above the overflow part and are connected to the discharge port of the salt leg, the inlet pipe outlet End is across the overflow part and extends in the elutriation portion.

9. salt elutriation apparatus according to claim 8, which is characterized in that the desalinization of soil by flooding or leaching device further include:

Blender is set in the elutriation portion.

10. salt elutriation apparatus according to claim 8 or claim 9, which is characterized in that the overflow part and elutriation portion are by from upper Tapered buffer part connection under and.

11. salt elutriation apparatus according to claim 10, which is characterized in that the salt leg includes setting gradually from top to bottom Inverted round stage cylinder, intermediate cylinder and conically shaped；

Liquid import is eluriated in the conically shaped bottom setting first；

At least one discharge port is arranged in the intermediate cylinder.

12. salt elutriation apparatus according to claim 11, which is characterized in that when the discharge port is multiple, multiple dischargings Mouth is located at different setting height.

13. salt elutriation apparatus according to claim 11 or 12, which is characterized in that the setting height of the discharge port is higher than The setting height of the input end of the inlet pipe；Or

Setting height of the setting height of the discharge port lower than the input end of the inlet pipe, the salt slurry of the discharge port outflow It is input in the inlet pipe by pump.

14. a kind of salt making apparatus, which is characterized in that including the salt elutriation apparatus as described in any in claim 7 to 13.

15. a kind of high slat-containing wastewater processing system, which is characterized in that washed in a pan including the salt as described in any in claim 7 to 13 Wash equipment.